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A kind of high-voltage lithium nickel manganese oxide/graphite lithium ion battery and its manufacturing method

A lithium ion battery, lithium nickel manganese oxide technology, applied in the field of high-voltage lithium nickel manganate/graphite lithium ion battery production, can solve the problems of capacity decay, no use value, etc., to increase the capacity value and improve the specific capacity of the battery Play and optimize the effect of the ratio

Active Publication Date: 2019-06-14
GUANGXI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It has been reported that the main reason for restricting its commercial large-scale application is that after being assembled into a full battery, the capacity will decline significantly with the cycle, and there is almost no use value.

Method used

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  • A kind of high-voltage lithium nickel manganese oxide/graphite lithium ion battery and its manufacturing method
  • A kind of high-voltage lithium nickel manganese oxide/graphite lithium ion battery and its manufacturing method
  • A kind of high-voltage lithium nickel manganese oxide/graphite lithium ion battery and its manufacturing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Example 1 (comparative example)

[0047] A method for manufacturing a lithium ion battery includes the following steps:

[0048] (1) Preparation of negative electrode pieces: According to the conventional negative electrode slurry preparation method, the negative electrode material, conductive agent, and binder are mixed and dissolved in deionized water at a ratio of 90:2.5:2.5, and the negative electrode slurry is adjusted after sufficient stirring. The viscosity is 3500mPa.s and the solid content is 32%. After baking and filming, the thickness is 0.166mm, and the surface density of the negative electrode is 105g / m. 2 The conventional negative pole piece;

[0049] (2) Preparation of positive pole pieces: According to the conventional method of preparing negative pole pieces, mix the positive electrode LNMO material, the binder PVDF, and the conductive agent AB, and then add them to the organic solvent NMP to prepare the positive electrode slurry to ensure the battery capacit...

Embodiment 2

[0053] A manufacturing method of a high-voltage lithium nickel manganate / graphite lithium ion battery includes the following steps:

[0054] (1) Preparation of negative electrode slurry: the method is the same as in Example 1, and the negative electrode slurry is prepared;

[0055] (2) Preparation of the negative electrode sheet containing the initial state SEI film: After the negative electrode slurry is fully mixed and uniform, 3wt% of organic acid grease is added to prepare the negative electrode slurry containing the initial state SEI film, after baking and filming process Prepare the negative pole piece containing the initial state SEI film, the thickness is 0.166mm, and the surface density of the negative electrode is 105g / m. 2 ;

[0056] (3) Preparation of the positive pole piece: According to the conventional method of preparing the negative pole piece, mix the positive electrode LNMO material, the binder PVDF, and the conductive agent AB, and then add it to the organic solve...

Embodiment 3

[0060] A manufacturing method of a high-voltage lithium nickel manganate / graphite lithium ion battery includes the following steps:

[0061] (1) The previous steps are the same as in Example 2, and the negative electrode piece containing the initial state SEI film is prepared;

[0062] (2) Preparation of 2wt% LTO coated LNMO positive pole piece:

[0063] First, prepare 2wt% LTO coated LNMO composite cathode material:

[0064] Take 1.6g of LNMO cathode material and dissolve it in deionized water, add 0.02g of surfactant F127 and mix to obtain A solution;

[0065] Weigh 0.096g titanium sulfate (Ti(SO 4 ) 2 ) Dissolve in 50ml of deionized water, add urea as a precipitant, and formulate a 0.5mol / l aqueous solution of titanium sulfate according to the molar ratio of titanium sulfate / urea of ​​1:2 to obtain liquid B. The amount of titanium sulfate must be TiO 2 2wt% of the mass of LNMO;

[0066] Slowly add liquid B to the continuously stirred liquid A. After stirring for 5 hours, transfer it t...

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Abstract

The invention discloses a high-voltage lithium nickel manganese oxide / graphite lithium ion battery and a manufacturing method thereof, and proposes modifying the surface of the negative electrode with an organic acid ester to change the components of the SEI film and strengthen the stability of the interface between the electrolyte and the electrode. So as to effectively curb the rapid decline of capacity. In the present invention, by optimizing the electrolyte, adding functional additives to the traditional organic electrolyte, the initial efficiency of the battery is improved, the self-discharge of the battery is suppressed, the specific capacity of the battery is increased, and a battery with a high specific capacity and a long cycle is realized. In order to further stabilize the efficient operation of the LNMO / graphite lithium-ion battery with high specific capacity and long cycle life, and further improve the stability of the battery, the present invention also proposes to modify the positive electrode. The LNMO@LTO cathode material is prepared by coating LNMO with Li4Ti5O12. The coating layer can effectively avoid the direct contact between the electrolyte and the active material body, reduce the overflow of Mn from the cathode material, and reduce the further catalytic effect of Mn on the SEI film, making the system more stable.

Description

Technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a method for manufacturing a high-voltage lithium nickel manganate / graphite lithium ion battery. Background technique [0002] Compared with traditional secondary batteries, lithium-ion batteries, as a new type of energy storage device, have the advantages of higher energy density and working voltage, long service life and low environmental pollution. With the development of lithium-ion battery technology, The application market of lithium-ion batteries will be more extensive and in-depth. However, compared with the rapid development of modernization and industry needs, the performance of lithium batteries needs to be further improved. According to the goals mentioned in the "Energy-saving and New Energy Automobile Industry Development Plan (2012-2020)" promulgated by the State Council, the energy density of power battery modules will reach 300Wh / kg by 2020 (correspondi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/058H01M10/0525H01M4/133H01M4/1393H01M4/131H01M4/1391H01M4/62H01M10/0567
CPCH01M4/131H01M4/133H01M4/1391H01M4/1393H01M4/62H01M10/0525H01M10/0567H01M10/058H01M2220/20H01M2300/0025Y02E60/10Y02P70/50
Inventor 李庆余解雪松王红强黄有国赖飞燕顾慈兵孙铭雪朱传奇
Owner GUANGXI NORMAL UNIV
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